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Médard, Molongo Mokondande
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Physics Transportation

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Yield of Cassava Leaves (Manihot Esculenta Crantz Var Obama II) in Relation to Some Harvesting Modalities During the Crop Cycle in the Hinterland of Kisangani (Tshopo Province, R.D. Congo) Fiston, Chebele Basila; Médard, Molongo Mokondande; Faustin, Ngama Boloy; Liston, Ofeka Kelekele; Joseph, Litucha Bakokola
Budapest International Research in Exact Sciences (BirEx) Journal Vol 6, No 1 (2024): Budapest International Research in Exact Sciences, January
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v6i1.7816

Abstract

The study examined the impact of three cassava leaf harvesting methods on the growth and leaf yield of the Obama II variety in Kisangani. The three methods were light picking (CL), moderate picking (CM) and coarse picking (CG). Results showed that plant diameter was not affected by harvesting method, but plant height and number of tender shoots were. Rough harvesting produced the tallest plants with the most tender shoots. Yields of fresh cassava leaves varied according to harvesting method, ranging from 5.36 to 12.27 t/ha, with rough picking giving the highest yield. However, light picking had the highest rates of leaf removal (63.8%) and wilting (55.4%), followed by moderate picking (CM: 49.6% rate of leaf removal and 39.0% of wilting), while coarse picking had the lowest rates of leaf removal (21.6%) and wilting (18.6%).
Bimonthly cassava (Manihot esculenta C.) leaf yield in relation to secondary infection of the crop by African Cassava Mosaic in the Provinces of Nord-Ubangi and Tshopo in the Democratic Republic of Congo Médard, Molongo Mokondande; Sylvain, Solia Edondoto; Joseph, Litucha Bakokola; Godefroid, Monde te-Kazangba; Bénoît, Dhed'a Djaïlo
Budapest International Research in Exact Sciences (BirEx) Journal Vol 5, No 4 (2023): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v5i4.7763

Abstract

The present study aimed to evaluate the yield of cassava (Manihot et al.) leaves harvested bimonthly in relation to the level of secondary infection of the crop by MAM in Kisangani and Gbadolite respectively, in the provinces of Tshopo and Nord-Ubangi in the Democratic Republic of Congo. An experimental randomized complete block design was chosen, with 4 replicates and 5 treatments according to infection levels, including Level 0: No symptoms (apparently healthy subject); Level 1: Yellowish spots covering 1/5ème of the leaf blade (light mosaic); Level 2: Spots covering half the leaf blade, and appearance of leaf deformation (moderate mosaic); Level 3: Affected leaves deformed and partly curled up, vegetative apparatus reduced (strong mosaic); Level 4: Almost all leaf blades curled up, vegetative apparatus reduced (severe mosaic); Level 5: Leaves reduced to about 1/10ème of their surface area; on some, the leaf blade becomes non-existent, twigs very short, generally knotted, plant dies within a few months. Leaf yields recorded in Kisangani were in the order of 1.99 T/ha (Level zero, apparent absence of mosaic); 1.73 T/ha (Level 1, light mosaic); 2.13 T/ha (Level 2, moderate mosaic); 1.66 T/ha (Level 3, strong mosaic); 1.16 T/ha (Level 4, severe mosaic) with the Mbongo variety. On the other hand, at Gbadolite, 2.63 T/ha (Level zero, apparent absence of mosaic); 2.67 T/ha (Level 1, light mosaic); 3.01 T/ha (Level 2, moderate mosaic); 2.26 T/ha (Level 3, strong mosaic); 1.89 T/ha (Level 4, severe mosaic) were obtained with the Yasegumba variety. With the exception of levels 1 and 2, MAM caused yields to fall by 13.1 to 41.7% and 14.07 to 28.14% from level 1 (light mosaic) to level 4 (severe mosaic) by adopting bimonthly harvesting in Kisangani and Gbadolite respectively. This harvest is, therefore, one of the best techniques for managing MAM and producing leaves.
Effect of Thermal Variation and Steaming Time on the Rejection Capacity of Plantain (Musa Sapientum L.) at Gbadolite in the Democratic Republic of Congo Médard, Molongo Mokondande; Gustave, Apilima Ngandoa; Benjami, Dowiya Nzawele; Médard, Songbo Kwedugbu; Gofroid, Monde te-Kazangba
Budapest International Research in Exact Sciences (BirEx) Journal Vol 5, No 4 (2023): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v5i4.7759

Abstract

The present study aimed to observe the effect of thermal variation and steaming time on the rejection capacity of plantain at Gbadolite in the Democratic Republic of Congo. The steamer was used to provide dry heat at the buckling scale according to the temperature and duration of steaming under in vitro conditions at the following temperatures and durations: 50°C, 80, 100 and 120°C for 1', 3 and 10'. Oven-dried subjects were set up in 4 randomized complete blocks, each containing 13 treatments: T0: control or non-oven-dried subject; T1: oven-dried reject at 50°C for 1'; T2: oven-dried reject at 50°C for 3'; T3: oven-dried reject at 50°C for 10'; T4: oven-dried reject at 80°C for 1'; T5: oven-dried reject at 80°C for 3'; T6: discharge steamed at 80 °C for 10'; T7: discharge steamed at 100 °C for 1'; T8: discharge steamed at 100 °C for 3'; T9: discharge steamed at 100 °C for 10'; T10: discharge steamed at 120 °C for 1'; T11: reject steamed at 120°C for 3'; T12: reject steamed at 120°C for 10'; 19; 22; 21; 22; 27; 28; 26; 25; 23; 26; 32; 48; 33 rejects per explant were obtained respectively. Thus, the best treatment remains explants steamed at 120° for 3'. In other words, explants should be heat-excited to stimulate rejection and shorten the weaning period.
Influence of the Weight of Mini Corm Fragments on the Rejection Power of Plantain (Musa sapientum L.) Ex-Situ at Gbadolite in the Democratic Republic of Congo Médard, Molongo Mokondande; Cornélie, Nzibe Mindende; Jacques, Toteanago Mazingi; Bertin, Libwa Momi; Junior, Ambwa Lokula
Budapest International Research in Exact Sciences (BirEx) Journal Vol 5, No 4 (2023): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v5i4.7762

Abstract

This study tested the influence of bulb fragments on the rejection potential of plantain ex-situ. The experimental set-up chosen was that of randomized complete blocks comprising 4 blocks and 4 treatments according to the weights of the minisets. Treatments were assigned to line plots under ex-situ conditions. They were made up of the following fragments: T0 (20g fragment), T1 (5g fragment), T2 (10g fragment), and T3 (15g fragment) at a rate of 150 minisets per treatment installed on a propagator in a greenhouse. For each bulb, 4, 17, 18 and 21 rejections were counted, respectively, for the control: T1 (5g fragment), T2 (10g fragment), T3 (15g fragment) and T0 (20g fragment). In the event of a shortage of planting material, the bulb can be cut into mini-pieces of around 10g, i.e., 2/4 of a bulb, in order to increase the rejection potential and thus produce planting material.
Co-Authors Benjami, Dowiya Nzawele Bénoît, Dhed'a Djaïlo Bertin, Libwa Momi Cornélie, Nzibe Mindende Faustin, Ngama Boloy Fiston, Chebele Basila Godefroid, Monde te-Kazangba Gofroid, Monde te-Kazangba Gustave, Apilima Ngandoa Jacques, Toteanago Mazingi Joseph, Litucha Bakokola Junior, Ambwa Lokula Liston, Ofeka Kelekele Médard, Songbo Kwedugbu Sylvain, Solia Edondoto